6th grade math help me please

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

What is the value of the expression below? 148+(-6)| + |– 35= 7|

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2